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821 

WWUS20 KWNS 190943

SEL4

SPC WW 190943

TXZ000-191700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 84

NWS STORM PREDICTION CENTER NORMAN OK

440 AM CDT MON MAR 19 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST-CENTRAL TEXAS



EFFECTIVE THIS MONDAY MORNING FROM 440 AM UNTIL NOON CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH

NORTHEAST OF ABILENE TEXAS TO 105 MILES SOUTHWEST OF SAN ANGELO

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 81...WW 83...



DISCUSSION...REGENERATIVE TSTM DEVELOPMENT IS ONGOING EARLY THIS

MORNING ALONG QUASI-STATIONARY PACIFIC FRONT/DRYLINE OVER THE LOW

ROLLING PLAINS AND PERMIAN BASIN.  THE EMERGENCE OF A WEAK MIDLEVEL

IMPULSE FROM THE TX BIG BEND MAY ALLOW FOR A MORE SIGNIFICANT EWD

PUSH TO FRONT WITHIN THE NEXT FEW HOURS.  AMBIENT INFLOW ENVIRONMENT

TO ONGOING STORMS IS MOIST AND MODERATELY UNSTABLE WITH MLCAPE

VALUES OF 1000-1500 J/KG.  GIVEN THE RELATIVELY STRONG VERTICAL

SHEAR...THE SETUP WILL REMAIN FAVORABLE FOR EMBEDDED SUPERCELL AND

BOWING STRUCTURES CAPABLE OF DAMAGING WINDS AND LARGE HAIL.  A LOW

RISK FOR TORNADOES DOES EXIST...HOWEVER CONSIDERABLE COLD POOL

DEVELOPMENT /PER RADAR DATA/ AND SUBSTANTIAL CONVECTIVE INHIBITION

ARE EXPECTED TO LIMIT A MORE ROBUST THREAT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 23035.





...MEAD

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